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Fair Value of Financial Instruments (Details) (USD $)
|
3 Months Ended |
9 Months Ended |
|
|
Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Fair value of assets and liabilities measured on recurring basis |
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|
|
|
|
| Deferred compensation trusts |
$ 364,622,000 |
|
$ 364,622,000 |
|
$ 332,904,000 |
| Other-than-temporary impairment of available-for-sale securities |
|
|
0 |
|
|
| Proceeds from the sales and maturities of available-for-sale securities |
29,000,000 |
85,000,000 |
235,000,000 |
434,000,000 |
|
|
Minimum
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|
|
|
|
|
| Fair value of assets and liabilities measured on recurring basis |
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|
|
|
|
| Debt securities maturity period |
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|
1 year |
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|
|
Maximum
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|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
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|
|
|
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| Debt securities maturity period |
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3 years |
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|
Fair Value, Measurements, Recurring | Money market funds
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|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
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| Available-for-sale securities |
19,000,000 |
|
19,000,000 |
|
14,000,000 |
|
Fair Value, Measurements, Recurring | U.S. agency securities
|
|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
|
| Available-for-sale securities |
157,000,000 |
|
157,000,000 |
|
161,000,000 |
|
Fair Value, Measurements, Recurring | U.S. Treasury securities
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|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
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| Available-for-sale securities |
21,000,000 |
|
21,000,000 |
|
67,000,000 |
|
Fair Value, Measurements, Recurring | Corporate debt securities
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|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
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| Available-for-sale securities |
223,000,000 |
|
223,000,000 |
|
184,000,000 |
|
Fair Value, Measurements, Recurring | Commercial paper
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|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
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| Available-for-sale securities |
10,000,000 |
|
10,000,000 |
|
|
|
Fair Value, Measurements, Recurring | Other debt securities
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|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
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| Available-for-sale securities |
6,000,000 |
|
6,000,000 |
|
9,000,000 |
|
Fair Value, Measurements, Recurring | Total
|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
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| Cash and cash equivalents |
19,114,000 |
|
19,114,000 |
|
14,457,000 |
| Marketable securities, current |
135,098,000 |
|
135,098,000 |
|
102,439,000 |
| Deferred compensation trusts |
81,350,000 |
|
81,350,000 |
|
80,842,000 |
| Marketable securities, noncurrent |
281,999,000 |
|
281,999,000 |
|
318,355,000 |
|
Fair Value, Measurements, Recurring | Total | Commodity contracts
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|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
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|
|
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| Derivative assets |
219,000 |
|
219,000 |
|
95,000 |
| Derivative liabilities |
290,000 |
|
290,000 |
|
28,000 |
|
Fair Value, Measurements, Recurring | Total | Foreign currency contracts
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|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
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|
|
|
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| Derivative assets |
805,000 |
|
805,000 |
|
640,000 |
| Derivative liabilities |
3,344,000 |
|
3,344,000 |
|
2,151,000 |
|
Fair Value, Measurements, Recurring | Level 1
|
|
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| Fair value of assets and liabilities measured on recurring basis |
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|
|
|
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| Cash and cash equivalents |
19,114,000 |
|
19,114,000 |
|
14,457,000 |
| Deferred compensation trusts |
81,350,000 |
|
81,350,000 |
|
80,842,000 |
|
Fair Value, Measurements, Recurring | Level 2
|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
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| Marketable securities, current |
135,098,000 |
|
135,098,000 |
|
102,439,000 |
| Marketable securities, noncurrent |
281,999,000 |
|
281,999,000 |
|
318,355,000 |
|
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts
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|
|
|
|
|
| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
|
| Derivative assets |
219,000 |
|
219,000 |
|
95,000 |
| Derivative liabilities |
290,000 |
|
290,000 |
|
28,000 |
|
Fair Value, Measurements, Recurring | Level 2 | Foreign currency contracts
|
|
|
|
|
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| Fair value of assets and liabilities measured on recurring basis |
|
|
|
|
|
| Derivative assets |
805,000 |
|
805,000 |
|
640,000 |
| Derivative liabilities |
$ 3,344,000 |
|
$ 3,344,000 |
|
$ 2,151,000 |